NioTcpChannel sporadically returns null in getPeerAddress although connected

After updating to 3.0.8.GA (from 3.0.3.GA) i experience ConnectedStreamChannels that claim to be connected but return 'null' for the peer address, when starting a few thousand short lived connections on 100 threads in parallel with code like:

Thread 1:
IoFuture<ConnectedStreamChannel> futureChannel = worker.connectStream(targetAddress,null, CHANNEL_OPTIONS);
--> Now hand futureChannel to thread 2.

Thread 2:
Status status = futureChannel.await(10, TimeUnit.SECCONDS);
switch (status)
{
case DONE:
SocketAddress sa = futureChannel.get().getPeerAddress();

--> about between 1 and 3 in 1000 channels returns 'null' here.

It did certainly not happen with 3.0.3.GA where I could create several 100000 connections with >100 threads in parallel an never once had this effect.